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Metal recovery method in waste nickel-cadmium battery

A nickel-cadmium battery, metal technology, applied in the improvement of process efficiency, instruments, optics, etc., can solve the problems of low recovery rate and low cadmium purity, and achieve the effect of improving the utilization rate

Inactive Publication Date: 2009-06-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of low purity and low recovery rate of cadmium obtained in the recycling method of metal in waste nickel-cadmium batteries in the prior art, and provide a waste battery with high purity and high recovery rate of cadmium obtained. Metal recovery method in nickel-cadmium battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment illustrates the method for recovering metals in spent nickel-cadmium batteries provided by the present invention.

[0021] Put 0.5 kg of nickel-cadmium battery (Shenzhen Tianhou Battery Company, No. 7 battery, AAA type, containing 65 grams of cadmium and 150 grams of nickel) into a vacuum furnace, and heat it at 500 ° C under a pressure of 0.04 MPa , the heating time was 6 hours, and 0.48 kg of waste residue was obtained.

[0022] The waste residue was soaked in 5 kg of an aqueous solution containing hydrogen peroxide and sulfuric acid (the content of hydrogen peroxide was 40% by weight and the concentration of sulfuric acid was 5 mol / liter) at a temperature of 70° C. for 5 hours. Filtrate was obtained by filtration, the filter residue was washed with nitric acid, and the washed solution was incorporated into the filtrate. The pH value of the filtrate was adjusted to 1 with sodium hydroxide, and then the filtrate was electrolyzed in an electrolytic cell...

Embodiment 2

[0026] This embodiment illustrates the method for recovering metals in spent nickel-cadmium batteries provided by the present invention.

[0027] Put 0.5 kg of nickel-cadmium battery (Shenzhen Tianhou Battery Company, No. 7 battery, AAA type, containing 65 grams of cadmium and 150 grams of nickel) into a vacuum furnace, and heat it at 550 ° C under a pressure of 0.05 MPa , the heating time was 4 hours, and 0.47 kg of waste residue was obtained.

[0028] The waste residue was soaked in 3 kg of an aqueous solution containing hydrogen peroxide and sulfuric acid (the content of hydrogen peroxide was 30% by weight and the concentration of sulfuric acid was 4 mol / liter) at a temperature of 80° C. for 5 hours. Filtrate was obtained by filtration, the filter residue was washed with nitric acid, and the washed solution was incorporated into the filtrate. The pH value of the filtrate is adjusted to 2 with sodium hydroxide, and then the filtrate is electrolyzed at 25°C with stainless st...

Embodiment 3

[0032] This embodiment illustrates the method for recovering metals in spent nickel-cadmium batteries provided by the present invention.

[0033] Put 0.5 kg of nickel-cadmium batteries (Shenzhen Tianhou Battery Company, No. 7 battery, AAA type, containing 65 grams of cadmium and 150 grams of nickel) into a vacuum furnace, under the pressure of 0.08 MPa and the presence of 0.1 kg of anthracite Heating was carried out at 400° C. for 3 hours to obtain 0.48 kg of waste residue.

[0034] The waste residue was soaked in 10 kg of aqueous solution containing hydrogen peroxide and sulfuric acid (the content of hydrogen peroxide was 30% by weight and the concentration of sulfuric acid was 3 mol / liter) at a temperature of 60° C. for 8 hours. Filtrate was obtained by filtration, the filter residue was washed with nitric acid, and the washed solution was incorporated into the filtrate. The pH value of the filtrate was adjusted to 1 with sodium hydroxide, and then the filtrate was electrol...

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PUM

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Abstract

The invention provides a method for recovering metal from waste nickel-cadmium cells. The method comprises: waste residue obtained after removing organic matters from the waste nickel-cadmium cell is contacted with a solution which can fully dissolve metal in the waste residue to be ionic state, so that the metal in the waste residue exists in the ionic state; and the mixing solution is filtered to obtain filtrate. The method also comprises that the filtrate is electrolyzed under conditions that current density is between 80 and 120A / m<2> and pH value is below 2 to obtain metal cadmium. The cadmium obtained by the method has high purity and recovery ratio.

Description

technical field [0001] The invention relates to a recovery method of waste batteries, in particular to a recovery method of metals in waste nickel-cadmium batteries. Background technique [0002] Nickel-cadmium batteries have the advantages of large capacity, long life, simple manufacture and low cost, and the number of cycles can reach hundreds or even thousands of times. With the development of the national economy, nickel-cadmium batteries have been widely used in power supply systems for national defense, fire protection, aerospace, household appliances, office machines, communication equipment, and electric tools. [0003] A nickel-cadmium battery generally includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The positive electrode is usually nickel foam, and the negative electrode includes a negative electrode conductive matrix and a negative electrode material coated on the negative electrode c...

Claims

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Application Information

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IPC IPC(8): C25C1/16C22B7/00
CPCY02P10/20
Inventor 祝学远
Owner BYD CO LTD